Blend the Base:
Add ice, milk, vanilla ice cream (or whipped topping), vanilla extract, chocolate cookies, and frosting into a blender.
Blend until smooth and creamy.
Taste and adjust sweetness or color by adding more frosting or food coloring if needed.
Prepare the Cup:
Swirl a bit of blue frosting or white chocolate sauce around the inside of your serving glass (optional but pretty!).
Pour & Garnish:
Pour your blended frappuccino into the glass.
Top with a big swirl of whipped cream.
Sprinkle crushed Oreos and blue sprinkles or glitter on top.